Which song will reign supreme as the Song Of Summer 2015? We're going through some of the top contenders of the year so far. Place your vote for your fave!

The summer season is nearly upon us, which means it's that time once again for true lovers of music to endlessly bicker over a much coveted glory: The Song Of The Summer, a title bestowed upon one song per year that will soon go on to be memed to death by the Internet, blasted every hour on the hour at every club and played ad nauseum on radio until absolutely no one enjoys it by the time summer ends...apart from that one friend from high school, who will still use it to caption their Instagram photos through to November.

Last year, Charli XCX and Iggy Azalea's "Fancy" took the title with their inescapable bop, "Fancy." And back in 2013, Robin Thicke's (now legally blurry) "Blurred Lines" with Pharrell and T.I. reigned. But who will ultimately supply the summer sound of 2015?

We're kicking off the search all week with some of the top possible contenders angling for the crown.

Who's up first?

CONTENDER ONE
The song: "Pretty Girls"
The performer(s): Britney Spears & Iggy Azalea
The producer(s): The Invisible Men
The charts: No. 29 as of May 13 (peak position to date)
The video: Earth Girls Are Easy-inspired alien-turned-Valley Girl shenanigans. And totally good acting. Like, total-lay.
The reasoning: Let's just get it out of the way now: Yes, "Pretty Girls" sounds a whole lot like last year's Song Of The Summer, "Fancy." It also happens to feature the same artist who made that song popular (I-G-G-Y), as well as the same production team (The Invisible Men). That being said, the pretty girl empowerment anthem has enough of its own cool and funky charm! The campy cut features The Holy Spearit serving up old school Adlibney (those runs at the end!) and undeniable earworms ("Like bees to the hon-ay!"). The song supplies more than enough sass to provide the soundtrack to countless nights out on the town with all your pretty girls in tow. So pret-tay!

CONTENDER TWO

The song: "Lean On"
The performer(s): Major Lazer, DJ Snake and MØ
The producer(s): Diplo, DJ Snake
The charts: No. 52 as of May 13 (peak position to date)
The video: A colorful, Bollywood-inspired Indian bonanza.
The reasoning: Diplo brings the #TurnUp tracks time and time again, especially when it starts getting hot outside. "Express Yourself"? "Bubble Butt"? Twerk city. But this time around, the talented DJ/producer provides a somewhat more calm approach to dominating the dance floor, recruiting Danish songbird MØ to lay her scrappy vocals across his brand of forward-thinking beatz. The end result is a dance floor chameleon that could easily maneuver in between chill poolside hangouts and sweaty house parties.

The time has come to decide: Which of these two songs will move onto the next round? Vote now!